Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4083b8aae621359…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 04:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8fbdeea6f02ddb3369772d9c15090011 SHA-1: b4996093da967480f1915df7dc6772931e67d43b SHA-256: d4083b8aae621359156a7f99d4c5f6047b1429cf61e9e2f0e402a56089f9cbd4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The presence of numerous unknown URLs suggests an attempt to redirect users to potentially malicious sites. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://kaskad-74.ru/images/uploads/kalisugixobenasewose.pdf In PDF document text
    • http://0048.pl/48files/file/44362282355.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/39711154972.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/15616820873.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210908/210908013729704994jrmhox8auxps.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/80609182988.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/v5jg89j4i3ekj9corfa77jqpll/xolabelipoxami.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/galuzaza.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/fikufudetimizuxabag.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/48496829508.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/buwuxuxaxudugesoxeveg.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/zixemesapawibugunikaku.pdfIn PDF document text
    • http://recrute.fr/files/files/49136963790.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/kofomosoxobip.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422d918dfdd---78839940204.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/24056709802.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/pifubiteriteb.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/20458707451.pdfIn PDF document text
    • https://kar360.com/resimler/files/tofixijurapasogutazakor.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/40968070908.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/46083696742.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/88345749569.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/tobikuzemogisi.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/65770868485.pdfIn PDF document text
    • https://beldapin.com/calisma2/files/uploads/16425402749.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=among+us+new+update+pc+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 11036 bytes
SHA-256: 6bb7deefa2b5b1e5c658760b8731ef461592f5aaf2d7daf4ed13d29c658794b5
font_01_sfnt_off0000f65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 17336 bytes
SHA-256: efd6d768049369b9f4612dc862975c2a037d6c8e01d63e66eabbf317dcf2fb4e
font_02_sfnt_off00012313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1